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US 7,683,312 B2Granted
Fiber-optic interrogator with normalization filters
AssigneeUS Sensor Systems, Inc.
InventorsEric Lee Goldner, Gerald Robert Baker
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Abstract
A fiber optic interrogator includes a broadband optical source, at least one beam splitter directing output of the optical source to an array of fiber optic gratings, at least one linear transmission or reflection filter, at least one optical receiver and at least one amplifier associated with each receiver. In one aspect of the invention, a pair of opposite-sloped linear transmission filters are utilized to normalize the received and filtered reflections with respect to total optical power.
Claims9
An interrogator for a plurality of sensor fiber optic gratings comprising:
- a broadband optical source;
- a first beam splitter directing output of the optical source to the sensor fiber optic gratings;
- a second beam splitter directing reflections from the sensor fiber optic gratings to a pair of receive paths;
- an optical receiver in each receive path;
- at least one amplifier associated with each optical receiver;
- a pair of opposite-sloped linear filters, one in each receive path, whereby received, filtered reflections from the sensor fiber optic gratings are normalized with respect to total optical power.
3 more elements
Dependencies are inferred from the claim text.